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Origin has started a promotion along with the popular indie games promoter Humble Bundle, regarding 6+2 games that will be available for 14 days since August 14th. As for the previous Humble Bundles, the starting price for a valid set of Steam keys (and Origin keys, in this case) is one dollar for six games (Dead Space, Burnout Paradise, Crysis 2, Mirror's Edge, Dead Space 3 and Medal of Honor). By paying more than the average (which is currently around 4,8 dollars) you will also get Battlefield 3 and the Sims 3: Starter Pack. 

Aside of a small fraction of it, which goes to the Humble Bundle itself, all of the money goes to charity (Human Rights Campaign, Watsi, San Francisco AIDS Foundation, American Cancer Society, American Red Cross). Of course, you can donate as much as you like, and eventually adjust the shares destinated to each charity fund.

Note: usually, Humble Bundles key come as a "pack" to prevent misuse or reselling of the single keys.

https://www.humblebundle.com/

Have fun.

Paymore than the avarage of 4.78$ to unlock: Battlefield 3, The Sims 3 + Starter Pack
looks like all games but BF 3 and Sims 3 can be activated on both Steam and Orgin

Dead Space 3 is sold as an Origin key only aswell. Of course Origin has been almost impossible to use for redeeming keys during the last two days (more than 1 million bundles have been sold as of now). The average Humble Bundle solds about 100/200.000 copies - over two weeks.